/// <summary>
/// Searches the given source code file for a source element matching the given <see cref="SourceElement"/>.
/// If the source element can be found, a <see cref="SourceElementPosition"/> containing the start and end line numbers is returned.
/// Otherwise <c>null</c> is returned.
/// </summary>
/// <param name="filename">The filename.</param>
/// <param name="sourceElement">The source element.</param>
/// <returns>A <see cref="SourceElementPosition"/> or <c>null</c> if source element can not be found.</returns>
public static SourceElementPosition FindSourceElement(string filename, SourceElement sourceElement)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
if (sourceElement == null)
{
throw new ArgumentNullException("sourceElement");
}
// Is the node available in cache?
if (filename.Equals(lastFilename))
{
return FindSourceElement(new INode[] { lastNode }, sourceElement);
}
else
{
try
{
using (var parser = ICSharpCode.NRefactory.ParserFactory.CreateParser(filename))
{
if (parser == null)
{
return null;
}
parser.Parse();
if (parser.Errors.Count != 0 || parser.CompilationUnit == null || parser.CompilationUnit.CurrentBock == null)
{
return null;
}
else
{
// Cache the node
lastFilename = filename;
lastNode = parser.CompilationUnit.CurrentBock;
return FindSourceElement(new INode[] { parser.CompilationUnit.CurrentBock }, sourceElement);
}
}
}
catch (System.IO.IOException)
{
return null;
}
}
}
/// <summary>
/// Searches the given <see cref="ICSharpCode.NRefactory.Ast.INode">INodes</see> recursivly for the given <see cref="SourceElement"/>.
/// </summary>
/// <param name="nodes">The nodes.</param>
/// <param name="sourceElement">The source element.</param>
/// <returns>A <see cref="SourceElementPosition"/> or <c>null</c> if source element can not be found.</returns>
private static SourceElementPosition FindSourceElement(IEnumerable<INode> nodes, SourceElement sourceElement)
{
foreach (var node in nodes)
{
var sourceElementPosition = sourceElement.GetSourceElementPosition(node);
if (sourceElementPosition != null)
{
return sourceElementPosition;
}
}
foreach (var node in nodes)
{
var sourceElementPosition = FindSourceElement(node.Children, sourceElement);
if (sourceElementPosition != null)
{
return sourceElementPosition;
}
}
return null;
}